290 lines
7.2 KiB
C
290 lines
7.2 KiB
C
/* General "disassemble this chunk" code. Used for debugging. */
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#include "config.h"
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#include "dis-asm.h"
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#include "elf.h"
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#include <errno.h>
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#include "cpu.h"
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#include "exec-all.h"
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#include "disas.h"
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/* Filled in by elfload.c. Simplistic, but will do for now. */
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unsigned int disas_num_syms;
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void *disas_symtab;
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const char *disas_strtab;
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/* Get LENGTH bytes from info's buffer, at target address memaddr.
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Transfer them to myaddr. */
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int
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buffer_read_memory (memaddr, myaddr, length, info)
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bfd_vma memaddr;
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bfd_byte *myaddr;
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int length;
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struct disassemble_info *info;
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{
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if (memaddr < info->buffer_vma
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|| memaddr + length > info->buffer_vma + info->buffer_length)
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/* Out of bounds. Use EIO because GDB uses it. */
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return EIO;
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memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
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return 0;
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}
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#if !defined(CONFIG_USER_ONLY)
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/* Get LENGTH bytes from info's buffer, at target address memaddr.
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Transfer them to myaddr. */
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static int
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target_read_memory (memaddr, myaddr, length, info)
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bfd_vma memaddr;
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bfd_byte *myaddr;
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int length;
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struct disassemble_info *info;
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{
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int i;
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for(i = 0; i < length; i++) {
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myaddr[i] = ldub_code((void *)((long)memaddr + i));
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}
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return 0;
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}
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#endif
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/* Print an error message. We can assume that this is in response to
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an error return from buffer_read_memory. */
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void
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perror_memory (status, memaddr, info)
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int status;
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bfd_vma memaddr;
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struct disassemble_info *info;
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{
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if (status != EIO)
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/* Can't happen. */
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(*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
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else
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/* Actually, address between memaddr and memaddr + len was
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out of bounds. */
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(*info->fprintf_func) (info->stream,
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"Address 0x%llx is out of bounds.\n", memaddr);
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}
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/* This could be in a separate file, to save miniscule amounts of space
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in statically linked executables. */
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/* Just print the address is hex. This is included for completeness even
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though both GDB and objdump provide their own (to print symbolic
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addresses). */
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void
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generic_print_address (addr, info)
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bfd_vma addr;
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struct disassemble_info *info;
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{
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(*info->fprintf_func) (info->stream, "0x%llx", addr);
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}
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/* Just return the given address. */
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int
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generic_symbol_at_address (addr, info)
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bfd_vma addr;
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struct disassemble_info * info;
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{
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return 1;
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}
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bfd_vma bfd_getl32 (const bfd_byte *addr)
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{
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unsigned long v;
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v = (unsigned long) addr[0];
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v |= (unsigned long) addr[1] << 8;
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v |= (unsigned long) addr[2] << 16;
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v |= (unsigned long) addr[3] << 24;
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return (bfd_vma) v;
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}
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bfd_vma bfd_getb32 (const bfd_byte *addr)
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{
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unsigned long v;
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v = (unsigned long) addr[0] << 24;
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v |= (unsigned long) addr[1] << 16;
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v |= (unsigned long) addr[2] << 8;
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v |= (unsigned long) addr[3];
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return (bfd_vma) v;
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}
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/* Disassemble this for me please... (debugging). 'flags' is only used
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for i386: non zero means 16 bit code */
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void disas(FILE *out, void *code, unsigned long size, int is_host, int flags)
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{
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uint8_t *pc;
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int count;
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struct disassemble_info disasm_info;
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int (*print_insn)(bfd_vma pc, disassemble_info *info);
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INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
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#if !defined(CONFIG_USER_ONLY)
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if (!is_host) {
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disasm_info.read_memory_func = target_read_memory;
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}
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#endif
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disasm_info.buffer = code;
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disasm_info.buffer_vma = (unsigned long)code;
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disasm_info.buffer_length = size;
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if (is_host) {
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#ifdef WORDS_BIGENDIAN
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disasm_info.endian = BFD_ENDIAN_BIG;
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#else
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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#endif
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#if defined(__i386__)
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disasm_info.mach = bfd_mach_i386_i386;
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print_insn = print_insn_i386;
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#elif defined(__x86_64__)
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disasm_info.mach = bfd_mach_x86_64;
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print_insn = print_insn_i386;
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#elif defined(__powerpc__)
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print_insn = print_insn_ppc;
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#elif defined(__alpha__)
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print_insn = print_insn_alpha;
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#elif defined(__sparc__)
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print_insn = print_insn_sparc;
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#elif defined(__arm__)
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print_insn = print_insn_arm;
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#else
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fprintf(out, "Asm output not supported on this arch\n");
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return;
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#endif
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} else {
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#ifdef TARGET_WORDS_BIGENDIAN
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disasm_info.endian = BFD_ENDIAN_BIG;
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#else
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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#endif
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#if defined(TARGET_I386)
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if (!flags)
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disasm_info.mach = bfd_mach_i386_i386;
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else
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disasm_info.mach = bfd_mach_i386_i8086;
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print_insn = print_insn_i386;
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#elif defined(TARGET_ARM)
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print_insn = print_insn_arm;
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#elif defined(TARGET_SPARC)
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print_insn = print_insn_sparc;
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#elif defined(TARGET_PPC)
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print_insn = print_insn_ppc;
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#else
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fprintf(out, "Asm output not supported on this arch\n");
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return;
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#endif
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}
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for (pc = code; pc < (uint8_t *)code + size; pc += count) {
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fprintf(out, "0x%08lx: ", (long)pc);
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#ifdef __arm__
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/* since data are included in the code, it is better to
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display code data too */
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if (is_host) {
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fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc));
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}
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#endif
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count = print_insn((unsigned long)pc, &disasm_info);
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fprintf(out, "\n");
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if (count < 0)
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break;
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}
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}
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/* Look up symbol for debugging purpose. Returns "" if unknown. */
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const char *lookup_symbol(void *orig_addr)
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{
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unsigned int i;
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/* Hack, because we know this is x86. */
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Elf32_Sym *sym = disas_symtab;
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for (i = 0; i < disas_num_syms; i++) {
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if (sym[i].st_shndx == SHN_UNDEF
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|| sym[i].st_shndx >= SHN_LORESERVE)
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continue;
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if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
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continue;
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if ((long)orig_addr >= sym[i].st_value
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&& (long)orig_addr < sym[i].st_value + sym[i].st_size)
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return disas_strtab + sym[i].st_name;
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}
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return "";
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}
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#if !defined(CONFIG_USER_ONLY)
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static int monitor_disas_is_physical;
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static int
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monitor_read_memory (memaddr, myaddr, length, info)
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bfd_vma memaddr;
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bfd_byte *myaddr;
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int length;
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struct disassemble_info *info;
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{
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if (monitor_disas_is_physical) {
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cpu_physical_memory_rw(memaddr, myaddr, length, 0);
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} else {
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cpu_memory_rw_debug(cpu_single_env, memaddr,myaddr, length, 0);
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}
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return 0;
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}
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void monitor_disas(target_ulong pc, int nb_insn, int is_physical, int flags)
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{
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FILE *out;
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int count, i;
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struct disassemble_info disasm_info;
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int (*print_insn)(bfd_vma pc, disassemble_info *info);
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out = stdout;
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INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
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monitor_disas_is_physical = is_physical;
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disasm_info.read_memory_func = monitor_read_memory;
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disasm_info.buffer_vma = pc;
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#ifdef TARGET_WORDS_BIGENDIAN
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disasm_info.endian = BFD_ENDIAN_BIG;
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#else
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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#endif
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#if defined(TARGET_I386)
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if (!flags)
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disasm_info.mach = bfd_mach_i386_i386;
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else
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disasm_info.mach = bfd_mach_i386_i8086;
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print_insn = print_insn_i386;
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#elif defined(TARGET_ARM)
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print_insn = print_insn_arm;
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#elif defined(TARGET_SPARC)
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print_insn = print_insn_sparc;
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#elif defined(TARGET_PPC)
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print_insn = print_insn_ppc;
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#else
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fprintf(out, "Asm output not supported on this arch\n");
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return;
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#endif
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for(i = 0; i < nb_insn; i++) {
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fprintf(out, "0x%08lx: ", (unsigned long)pc);
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count = print_insn(pc, &disasm_info);
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fprintf(out, "\n");
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if (count < 0)
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break;
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pc += count;
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}
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}
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#endif
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